Buggy code:
public class PatchingTestUtil { private static final Logger logger = Logger . getLogger ( PatchingTestUtil . class ) ; public static final String CONTAINER = "jboss" ; public static final String AS_DISTRIBUTION = System . getProperty ( "jbossas.dist" ) ; public static final String AS_VERSION = System . getProperty ( "jbossas.version" ) ; public static final String PRODUCT = "WildFly" ; public static final String FILE_SEPARATOR = File . separator ; private static final String RELATIVE_PATCHES_PATH = Joiner . on ( PatchingTestUtil . FILE_SEPARATOR ) . join ( new String [ ] { MODULES , SYSTEM , LAYERS , BASE , OVERLAYS } ) ; public static final String PATCHES_PATH = ( ( PatchingTestUtil . AS_DISTRIBUTION ) + ( PatchingTestUtil . FILE_SEPARATOR ) ) + ( PatchingTestUtil . RELATIVE_PATCHES_PATH ) ; private static final String RELATIVE_MODULES_PATH = Joiner . on ( PatchingTestUtil . FILE_SEPARATOR ) . join ( new String [ ] { MODULES , SYSTEM , LAYERS , BASE } ) ; public static final String MODULES_PATH = ( ( PatchingTestUtil . AS_DISTRIBUTION ) + ( PatchingTestUtil . FILE_SEPARATOR ) ) + ( PatchingTestUtil . RELATIVE_MODULES_PATH ) ; public static final File BASE_MODULE_DIRECTORY = newFile ( new File ( PatchingTestUtil . AS_DISTRIBUTION ) , MODULES , SYSTEM , LAYERS , BASE ) ; public static final boolean doCleanup = Boolean . getBoolean ( "cleanup.tmp" ) ; public static String randomString ( ) { } public static String readFile ( String filePath ) throws FileNotFoundException { } public static void setFileContent ( String filePath , String content ) throws IOException { } public static void tree ( File dir ) { } private static void tree0 ( StringBuilder out , File dir , int indent , String tab ) { } public static File touch ( File baseDir , String ... segments ) throws IOException { } public static void dump ( File f , String content ) throws IOException { } public static void dump ( File f , byte [ ] content ) throws IOException { } public static File createModuleXmlFile ( File mainDir , String moduleName , String ... resources ) throws IOException { StringBuilder content = new StringBuilder ( "<?xml<seq2seq4repair_space>version=\"1.0\"<seq2seq4repair_space>encoding=\"UTF-8\"?>\n" ) ; <START_BUG> content . append ( String . format ( "<module<seq2seq4repair_space>xmlns=\"urn:jboss:module:1.2\"<seq2seq4repair_space>name=\"%s\"<seq2seq4repair_space>slot=\"main\"<seq2seq4repair_space>//>\n" , moduleName ) ) ; <END_BUG> content . append ( "<seq2seq4repair_space><resources>\n" ) ; content . append ( "<seq2seq4repair_space><resource-root<seq2seq4repair_space>path=\".\"//>\n" ) ; for ( String resource : resources ) { content . append ( String . format ( "<seq2seq4repair_space><resource-root<seq2seq4repair_space>path=\"%s\"//>\n" , resource ) ) ; } content . append ( "<seq2seq4repair_space><//resources>\n" ) ; content . append ( "<//module>\n" ) ; ROOT_LOGGER . trace ( content ) ; File moduleXMLFile = PatchingTestUtil . touch ( mainDir , "module.xml" ) ; PatchingTestUtil . dump ( moduleXMLFile , content . toString ( ) ) ; return moduleXMLFile ; } public static File createModule ( File baseDir , String moduleName , String ... resourcesContents ) throws IOException { } public static File createModule0 ( File baseDir , String moduleName , ResourceItem ... resourcesItems ) throws IOException { } public static File createModule1 ( File baseDir , String moduleName , String ... resourceFileNames ) throws IOException { } public static File createModuleRoot ( File baseDir , String moduleSpec ) throws IOException { } public static File createBundle0 ( File baseDir , String bundleName , String content ) throws IOException { } public static void createPatchXMLFile ( File dir , Patch patch ) throws Exception { } public static File createZippedPatchFile ( File sourceDir , String zipFileName ) { } public static File createInstalledImage ( DirectoryStructure env , String identity , String productName , String productVersion ) throws Exception { } public static void assertPatchElements ( File baseModuleDir , String [ ] patchElements ) { } public static void resetInstallationState ( final File home , final File ... layerDirs ) { } }

Fix:
content . append ( String . format ( "<module<seq2seq4repair_space>xmlns=\"urn:jboss:module:1.2\"<seq2seq4repair_space>name=\"%s\"<seq2seq4repair_space>slot=\"main\">\n" , moduleName ) ) ;